Apparatus for polishing metal articles



0. w. SADLER, 1R.

APPARATUS FOR POLISHING METAL ARTICLES.

APPLICATION FILED JAN. 31, I921.

mfim PatentedJime 6,1922.

2 SHEETS-SHEET I.

0. W. SADLER, 1a.; APPARATUS FOR POLISHING METAL ARTICLES.

APPLICATION FILISD JAN. 3 1, 192!- I Patented June 6, 1922.

2 SHEETS-SHEET 2 GTYB 1&18

INVENTQ CRIN W. SADLER, JR., OF BELLE VERNON, PENNSYLVANIA.

APPTUS FOR POLISHING METAL ARTICLES.

Specification of Letters Patent.

Patented Janet, 1922.

Application filed January 31, 1921. Serial No. 441,345.

To all whom it may concern:

Be it known that- I, Own W. SAoLnR, Jr., a citizen of the United States, and resident of Belle Vernon, in the county of Fayette and State of Pennsylvania, have invented a new and useful Improvement in Apparatus for Polishing Metal Articles; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to apparatus for polishing or grinding metal articles. While the invention has particular advantages in connection with the polishing or grinding of dies for drawing tubing and like circular articles, its application is not, in any sense, limited to such articles.

The object of my invention is to provide a simple and effective way of polishing or grinding the working faces of dies or like articles in which the abrasive acts on the working face of the die and in substantiall the same direction as the. flow of the work in cold drawing, so that there is less tendency to vmar or scratch the work. Where the polishing is done in a circumferential direction, as in the old process, there is a tendency to leave the surface grooved, so

that where the tube is being drawn through the die it is subjected to varying pressures, concentrating the pressure on the high spots and thereby increasing the tendency. to gall or abrade both die and tube, whereas by my method the face of the dieis brought nearer and nearer to a regular curve and pressure between the tube and die is thereby mere regularly distributed.

With these and other objects in view, my

invention comprises the novel features hereinafter set forth and claimed.

In the drawings, Fig. 1 is a vertical side elevation of myinvention partly in section; Fig.2 is a front view of the abrading belt, showing the different ositions 'of different sized work for obtaining proper angle of is the pulley 5 around which the belt 6 passes, said belt also passing around the pulley 7 on the shaft 8. On the shaft 8 is the pinion 8 which meshes with the pinion 10 on the shaft 11, said shaft being carried by the links 11 and 11". The pinion 10 meshes with the gear-wheel 12 on the shaft The shaft 13 is journaled in suitable hearings in the frame 18 and .at the outer end ofsaid shaft is a beveled friction wheel 14 which engages the beveled face 15 of the rotary-holder 16. Additional idle beveled friction-wheels 17 are provided, mounted in the circular portion 18 of the frame 18.

The rotary-holder 16 is stepped to form seats 19 of varying diameter to provide for the seating of dies of different diameters. The die 20, illustrated, is of such diameter as to fit in the uppermost seat of the rotary holder, andsaid die is of the ordinary type used in the cold drawing of seamless tu-bing having the wide'bell-mouth 21 on the intake side and the narrower or contracted outlet 22.

The frame 18 is movable up and down on the frame 2, suitable guides 23 being proby the hand-wheel 25 to provide for the ad,

justment of theiframe 18 for the purpose more fully hereinafter set forth.

Mounted on the shaft 4: is the pulley 26 around which the belt 27 passes, said belt also passing around the pulley 28 of smaller diameter on the shaft 29. The shaft 29 is mounted in bearings 30. which are slidable up and down in the guides 31 for purposes of adjustment to hold the belt 27 at the proper tautness, and for this purpose a link 32 is connected to the lug 33 on the bearing 30, and said link is connected by the strap 34; to the lever 35, adapted to' engage the toothed quadrant 36 in the ordinarymanner.

The belt 27 may be made of any suitable abrasive coated material such as emery cloth. The width of this belt may vary. according to requirements.

Where a die, like 20, is to be polished or ground, the die is placed on the rotary holder 16 with the abrading belt 27 passing through the same and bearing against the interior of the die at opposite points thereof, as indicated in full lines, Fig. 2, the

frame 18 having been previously adjusted so that the belt will have the proper angle. of contact to evenly polish or grind the faces of the die to be operated on. This angle may be varied by raising or lowering the frame 18. The motor 3 is started, and through the connections described a rotary movement is given to the holder 16 by the driving action of the friction wheel 14, and the die'20 carried thereby is rotated. At the same time the abrasive belt 27 is driven, and as the belt moves in opposite directions at the points of contact the tendency of the upward movement of the belt to dislodge the die from its seat will be counteracted by the downward movement of the belt, so that the die remains'securely seated during the polishing or grinding operation without the employment of any means for clamping the said die in position. The flexibility-of the belt permits it to conform to the curve of the die, and as the die is rotating and the belt moving all points on the die are subjected to the same polishing or grinding action, so that there is no variation of pressure to cause any scratching or marring of the die, and the fact that the abrasive cuts the working face of the die in substantially the same direction, as" the flow of the work causes less tendency to scratch the work when the die is in use.

lVhere a die of lesser angle is to be ground as shown in dotted lines, Fig. 2, the die is lowered, bringing the belt into closer relation, and for this reason it is desirable to have the pulley 28 of smaller diameter than the pulley 26. If, however, it is desired to polish or grind a double ended or double bell-mouth die, the result is accomplished by increasing the diameter of the lower pulley.

In Fig. 5 I have illustrated my invention in connection with a crossed belt, and by crossing the belt a sharp edge on the lower or cutting edge of the die is secured, as in the case of a circular punching die, and as the hole is kept larger at one end than at the other a proper amount o f relief is afforded. As a consequence the machine may be used, not only for polishing punching dies of circular and other forms, but also for sharpening them. Inasmuch as the abrasive action is quite rapid the machine may be used to shape or enlarge the hole in dies.

Again where a die is out of round, or slightly oval, it may be brought back to a more nearly circular shape by retarding the travel of the holder while the belt is in contact with the narrowerdiameter. This may be accomplished by exerting a slight pressure against the rotation of the holder with the hand, or mechanical means may be provided forthis purpose.

It will be apparent that there are many applications of my invention, and I do not wish to limit it in any way to the polishing of drawing or punching dies, such as referred to specifically, but wish.-to include within its scope any practical use to which it may be applied.

\Vhat I claim is:

1. In a machine of the character described, a rotary work-support having an opening, an abrasive belt passing through said opening, means for driving said belt, means for adjusting said belt and said support, the one with relation to the other, whereby the angle of contact of said belt with the work may be varied, and'means for rotating said support.

2. In a machine of the character described, the combination of a rotary worksupport having an opening, an abrasive belt passing through said opening adapted to engage the work resting on said support at opposite points thereon, means for'moving the belt at one point of contact in an opposite direction to the belt at the other point of contact, and means for rotating said support.

3. In a machine of the character described, the combination of a work-support having an opening, an endless belt passing through said opening, means for moving said work-support longitudinally of said belt, whereby the angle of contact of said belt with the work may be varied, and means for rotating the said support.

4. In a machine of the character described, the combination of a work-support having an opening, an endless cross-belt of abrasive material passing through said opening arranged to engage the work, and means for rotating said support.

5. In a machine of the character described, thecombination of a work-support having'an opening, an endless belt of abrasive material passing through said opening, and means for rotating said support.

6. In a machine of the character described, a work-support having an opening, an abrasive, belt passing through said opening arranged to engage the work at opposite points, means for driving said belt, and means for adjusting said belt and said support, one with relation to the other, whereby the angle of contact of said belt with the work at opposite points may be varied.

7. In a machine of the "character described, the combination of a work-support having an opening, an endless belt passing through said opening engaging the work at opposite points, and means for moving said work-support longitudinally of said belt, whereby the angle of contact of said belt with the Work at opposite points may be varied.

In testimony whereof, I, the said ORIN W. SADLER, J r., have hereunto set my hand.

ORIN IV. SADLER, JR. \Vitnesses:

Rom. D. TOTTEN, JOHN F. WILL. 

